Revert 127714 - Load the metro driver dll at startup

chrome/app/metro_driver_win.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_APP_METRO_DRIVER_WIN_H_
-#define CHROME_APP_METRO_DRIVER_WIN_H_
-
-#include <Windows.h>
-
-// Helper class to manage the metro driver dll. When present in the system,
-// the main process thread needs to call InitMetro(), normal execution of
-// chrome initialization will continue on a second thread while the main
-// thread will be servicing the metro message loop.
-class MetroDriver {
- public:
-  typedef int (*MainFn)(HINSTANCE instance);
-
-  MetroDriver();
-  // returns true if chrome is being launched in metro. If so we should
-  // call RunInMetro(). If not then we should just run chrome as usual.
-  bool in_metro_mode() const {  return (NULL != init_metro_fn_); }
-
-  // Enter the metro main function, which will only return when chrome metro
-  // is closed. Once metro has initialized, the dll creates a new thread
-  // which runs |main_fn|. This method returns when the chrome metro session
-  // is closed by the user.
-  int RunInMetro(HINSTANCE instance, MainFn main_fn);
-
- private:
-  void* init_metro_fn_;
-};
-
-#endif  // CHROME_APP_METRO_DRIVER_WIN_H_